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EXHIBIT 99.1
DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF JULY 5, 2005
<Table>
<Caption>
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR CURRENT TERM
- ------------------------------------------------------------------------------------------------------------------------------------
DOMESTIC DEEPWATER SEMISUBMERSIBLES (6)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Quest 3,500' Victory Class GOM Contracted Walter one assignment well from Noble
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Star 5,500' Victory Class GOM Contracted Kerr-McGee 220 day extension
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean America 5,500' Ocean Odyssey GOM Contracted Pioneer three wells
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Valiant 5,500' Ocean Odyssey GOM Contracted Kerr-McGee one well
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Victory 5,500' Victory Class GOM Contracted Shell two wells
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Confidence 7,500' DP Aker H-3.2 Modified GOM Contracted BP five-year term
- ------------------------------------------------------------------------------------------------------------------------------------
DOMESTIC 2ND/3RD GENERATION SEMISUBMERSIBLES (4)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Voyager 2,000' Victory Class GOM Contracted ATP two wells
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Concord 2,200' F&G SS-2000 GOM Contracted Amerada Hess one well
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Lexington 2,200' F&G SS-2000 GOM Shipyard DODI -
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Saratoga 2,200' F&G SS-2000 GOM Contracted LLOG three wells
- ------------------------------------------------------------------------------------------------------------------------------------
<Table>
<Caption>
RIG NAME DAYRATE (000S) START DATE EST. END DATE FUTURE CONTRACTS AND OTHER INFORMATION
- ------------------------------------------------------------------------------------------------------------------------------------
DOMESTIC DEEPWATER SEMISUBMERSIBLES (6)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Quest mid 120's mid June 2005 late July 2005 120 day term plus option with Noble in mid 120's
beginning mid June and ending mid Oct. 2005.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Star mid 70's early Dec. 2004 mid July 2005 90 day term extension plus option with Kerr-McGee in
low 140's beginning mid July 2005 and ending early
Oct. 2005; followed by 12 month extension with
Kerr-McGee in mid 170's beginning early Oct. 2005
and ending early Oct. 2006. Available; actively
marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean America low 150's early May 2005 mid Sept. 2005 Following assignment wells with Pioneer, first of
two extension wells with Mariner in mid 110's
beginning mid Sept. and ending late Oct.; followed
by second well with Mariner in low 130's beginning
late Oct. and ending early Jan. 2006; followed by
one year term plus option with Mariner in low 230's
beginning early Jan. 2006 and ending early Jan.
2007. Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Valiant low 130's late June 2005 mid Sept. 2005 180 day term extension with Kerr-McGee in low 150's
beginning mid Sept. 2005 and ending mid Mar. 2006.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Victory low 160's early June 2005 late July 2005 One well with Kerr-McGee in mid 180's beginning late
July and ending early Sept.; followed by one year
term with Murphy in low 200's beginning early Sept.
2005 and ending early Sept. 2006. Available;
actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Confidence mid 170's early Jan. 2001 early Jan. 2006 Two-year term plus option with BP in low 280's
beginning early Jan. 2006 and ending early Jan.
2008. Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
DOMESTIC 2ND/3RD GENERATION SEMISUBMERSIBLES (4)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Voyager mid 90's late June 2005 mid Aug. 2005 One well with Amerada Hess in low 110's beginning
mid Aug. and ending early Oct.; followed by LOI for
one well in low 110's beginning early Oct. and
ending late Nov.; followed by two wells plus option
with Amerada Hess in mid 120's beginning late Nov.
2005 and ending late Feb. 2006. Available; actively
marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Concord mid 120's late May 2005 late July 2005 One well with Kerr-McGee in mid 70's beginning late
July. and ending late Sept.; followed by two well
extension plus option with Kerr-McGee in mid 90's
beginning late Sept. and ending mid Dec. Available;
actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Lexington - - late Sept. 2005 Approximately 120-day Survey and maintenance between
second and third well, beginning late May and ending
late Sept. Following survey, two additional wells
with Walter in low 60's beginning late Sept. and
ending late Nov.; followed by one well plus option
with Walter in low 80's beginning late Nov. and
ending late Dec. 2005. Available; actively
marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Saratoga mid 60's mid Dec. 2004 mid July 2005 Two wells plus option with LLOG in low 110's
beginning mid July and ending mid Dec.; followed by
six month extension with LLOG in low 120's beginning
mid Dec. 2005 and ending mid June 2006. Available;
actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
2
DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF JULY 5, 2005
<Table>
<Caption>
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR CURRENT TERM
- ------------------------------------------------------------------------------------------------------------------------------------
DOMESTIC JACKUPS (12)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Crusader 200' Mat Cantilever GOM Contracted Unocal one well
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Drake 200' Mat Cantilever GOM Contracted ADTI/Samson one well
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Champion 250' Mat Slot GOM Contracted Hunt one well
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Columbia 250' Independent Leg Cantilever GOM Contracted Kerr-McGee Five wells
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Spartan 300' Independent Leg Cantilever GOM Contracted LLOG three wells plus option
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Spur 300' Independent Leg Cantilever GOM DODI - -
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean King 300' Independent Leg Cantilever GOM Contracted El Paso one well extension
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Nugget 300' Independent Leg Cantilever GOM Contracted Houston Expl. two wells plus option
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Summit 300' Independent Leg Cantilever GOM Contracted LLOG one well extension
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Warwick 300' Independent Leg Cantilever GOM Contracted Chevron 90 day term
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Titan 350' Independent Leg Cantilever GOM Contracted BHP one well plus option
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Tower 350' Independent Leg Cantilever GOM Contracted Chevron one well plus option
- ------------------------------------------------------------------------------------------------------------------------------------
<Table>
<Caption>
RIG NAME DAYRATE (000S) START DATE EST. END DATE FUTURE CONTRACTS AND OTHER INFORMATION
- ------------------------------------------------------------------------------------------------------------------------------------
DOMESTIC JACKUPS (12)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Crusader high 40's late June 2005 mid July 2005 Two wells plus option with Seneca in high 40's
beginning mid July and ending early Sept 2005.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Drake low 50's late June 2005 mid July 2005 Term contract with Chevron in low 50's beginning
mid July 2005 and ending late June 2006.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Champion mid 40's late June 2005 early Aug. 2005 Two well extension plus option with Hunt in low
50's beginning early Aug. and ending mid Oct.
2005. Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Columbia mid 40's early Jan. 2005 mid July 2005 Six month term plus option with Newfield in mid
50's beginning mid July 2005 and ending mid Jan.
2006. Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Spartan high 50's late June 2005 mid Sept. 2005 Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Spur - - - Maintenance/repairs late June through late Aug.
2005. Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean King mid 50's late June 2005 early July 2005 One well with El Paso in mid 60's beginning
early July and ending late July; followed by one
well extension in low 60's beginning late July
and ending early Aug. 2005; followed by one well
with Walter in high 60's beginning early Aug.
and ending late Aug. 2005. Available; actively
marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Nugget low 50's mid May 2005 mid Sept. 2005 Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Summit high 50's late June 2005 late July 2005 One well extension plus option with LLOG in mid
60's beginning late July and ending late Aug.
2005. Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Warwick low 60's late May 2005 early Aug. 2005 Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Titan mid 50's late Jan. 2005 late July. 2005 Three wells with Walter in mid 70's beginning
late July and ending late Oct. 2005. Available;
actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Tower mid 50's early Jan. 2005 mid Aug. 2005 One well extension plus option with Chevron in
high 60's beginning mid Aug. and ending early
Nov. 2005; followed by LOI for one well in mid
80's beginning early Nov. and ending late Dec.
2005. Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
3
DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF JULY 5, 2005
<Table>
<Caption>
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR CURRENT TERM
- ------------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL SEMISUBMERSIBLES (17)
- ------------------------------------------------------------------------------------------------------------------------------------
MEXICO
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Ambassador 1,100' Bethlehem SS-2000 GOM Contracted PEMEX four year term work
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Whittington 1,500' Aker H-3 GOM Contracted PEMEX four year term work
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Worker 3,500' F&G 9500 Enhanced Pacesetter GOM Contracted PEMEX four year term work
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Yorktown 2,850' F&G SS-2000 GOM Contracted PEMEX four year term work
- ------------------------------------------------------------------------------------------------------------------------------------
NORTH SEA
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Nomad 1,200' Aker H-3 North Sea Contracted Talisman one year
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Guardian 1,500' Earl & Wright Sedco 711 Series North Sea Contracted Shell one year
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Princess 1,500' Aker H-3 North Sea Contracted Talisman one year extension
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Vanguard 1,500' Bingo 3000 North Sea Contracted Statoil one year term
- ------------------------------------------------------------------------------------------------------------------------------------
AUSTRALASIA
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Bounty 1,500' Victory Class Australia Contracted ConocoPhillips two wells
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Patriot 1,500' Bingo 3000 Australia Contracted Santos three wells
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Epoch 1,640' Korkut Malaysia Contracted Murphy six wells plus option
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean General 1,640' Korkut Malaysia Contracted CTOC six wells
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Baroness 7,000' Victory Class Singapore Shipyard DODI -
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Rover 7,000' Victory Class Malaysia Contracted Murphy 950 day extension
- ------------------------------------------------------------------------------------------------------------------------------------
<Table>
<Caption>
RIG NAME DAYRATE (000S) START DATE EST. END DATE FUTURE CONTRACTS AND OTHER INFORMATION
- ------------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL SEMISUBMERSIBLES (17)
- ------------------------------------------------------------------------------------------------------------------------------------
MEXICO
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Ambassador mid 50's late July 2003 mid Dec. 2007 Available.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Whittington low 60's late July 2003 early Oct. 2006 Available.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Worker high 60's mid Aug. 2003 late July 2007 Available.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Yorktown mid 40's late Oct. 2003 mid July 2007 Available.
- ------------------------------------------------------------------------------------------------------------------------------------
NORTH SEA
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Nomad low 80's early Jan. 2005 late Jan. 2006 One year extension with Talisman in mid 150's
beginning late Jan. 2006 and ending late Jan. 2007.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Guardian low 80's late Mar. 2005 late Mar. 2006 One-year term extension plus option with Shell in
low 160's beginning late Mar. 2006 and ending late
Mar. 2007. Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Princess low 80's early Jan. 2005 late Dec. 2005 Two year extension with Talisman plus option in low
150's beginning in late Dec. 2005 and ending in late
Dec. 2007. Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Vanguard low 140's late May 2005 early Sept. 2006 One year plus option program in Norway with Statoil
in low 140's beginning in late May 2005 and ending
in early Sept. 2006 (time period to include one well
redrill with ENI in low 140's beginning late July
and ending late Oct. 2005). Available; actively
marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
AUSTRALASIA
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Bounty mid 80's late June 2005 late Sept. 2005 One well with Coogee Res. in mid 80's beginning late
Sept. and ending late Oct.; followed by two wells
plus option with Coogee in low 90's beginning late
Oct. and ending late Dec.; followed by LOI for one
well plus option in mid 90's beginning late Dec.
2005 and ending late Feb. 2006; followed by four
wells plus option in high 90's with Woodside
beginning late Feb. 2006 and ending late Aug. 2006.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Patriot high 70's late April 2005 early Aug. 2005 One well plus three options with Anzon in high 70's
beginning early Aug. and ending mid Sept.; followed
by one well with Bass Straits in high 70's beginning
mid Sept. and ending late Sept.; followed by one
well with Bass Straits in high 130's beginning late
Sept. and ending mid Oct.; followed by one well with
Apache in low 150's beginning mid Oct. and ending
mid Nov.; followed by first of four Anzon options in
mid 130's beginning mid Nov. and ending late Dec.;
followed by second of four Anzon options in upper
130's beginning late Dec. 2005 and ending late Jan.
2006; followed by third and fourth of four options
in low 140's beginning late Jan. 2006 and ending
early April; followed by Survey beginning early
April and ending mid April; followed by two
exercised option wells with Apache in high 70's
beginning mid April and ending early June; followed
by four wells plus option with NZOP in low 100's
beginning early June and ending late Dec. 2006.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Epoch mid 70's late April 2005 mid Dec. 2005 Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean General mid 70's mid June 2005 late Dec. 2006 Note: 5th & 6th wells in mid 90's beginning mid Oct.
and ending late Dec. 2005. LOI for one well plus
option in high 70's in Viet Nam beginning late Dec.
2005 and ending early Feb. 2006. Available; actively
marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Baroness - - - Shipyard/survey early June until mid Aug. Mobe to
GOM and prep for one year plus option with Amerada
Hess in low 200's beginning mid Oct. 2005 and ending
mid Oct. 2006. Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Rover mid 170's late June 2005 mid Jan. 2008 Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
4
DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF JULY 5, 2005
<Table>
<Caption>
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR CURRENT TERM
- ------------------------------------------------------------------------------------------------------------------------------------
BRAZIL
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Yatzy 3,300' DP DYVI Super Yatzy Brazil Contracted Petrobras 700 day extension
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Winner 3,500' Aker H-3 Brazil Contracted Petrobras 700 day extension
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Alliance 5,000' Alliance Class Brazil Contracted Petrobras one year extension
- ------------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL DRILLSHIPS (1)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Clipper 7,500' DP Fluor/Mitsubishi Brazil Contracted Petrobras 700 day extension
- ------------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL JACKUPS (2)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Sovereign 250' Independent Leg Cantilever Indonesia Contracted Santos eight wells
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Heritage 300' Independent Leg Cantilever Qatar Contracted Conoco/Phillips two wells plus option
- ------------------------------------------------------------------------------------------------------------------------------------
UPGRADE (1)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Endeavor 2,000' Victory Class Shipyard Upgrading DODI -
- ------------------------------------------------------------------------------------------------------------------------------------
COLD STACKED (1)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean New Era 1,500' Korkut GOM Cold Stacked DODI -
- ------------------------------------------------------------------------------------------------------------------------------------
PURCHASE PENDING--RESERVED FOR UPGRADE (1)
- ------------------------------------------------------------------------------------------------------------------------------------
Garden Banks** 2,200' Victory Class GOM Out of Service - -
- ------------------------------------------------------------------------------------------------------------------------------------
<Table>
<Caption>
RIG NAME DAYRATE (000S) START DATE EST. END DATE FUTURE CONTRACTS AND OTHER INFORMATION
- ------------------------------------------------------------------------------------------------------------------------------------
BRAZIL
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Yatzy mid 70's early Nov. 2003 early Oct. 2005 LOI for four-year term extension in mid 110's, plus
potential bonus, beginning early Oct. 2005 and
ending early Oct. 2009. Available; actively
marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Winner mid 50's early April 2004 mid Mar. 2006 LOI for four-year term extension in low 110's, plus
potential bonus, beginning mid Mar. 2006 and ending
mid Mar. 2010. Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Alliance high 90's early Sept. 2004 early Sept. 2005 LOI for four-year term extension in mid 150's, plus
potential bonus, beginning early Sept. 2005 and
ending early Sept. 2009. Available; actively
marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL DRILLSHIPS (1)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Clipper low 100's early Jan. 2003 mid Dec. 2005 LOI for five-year extension in low 180's, plus
potential bonus, beginning mid Dec. 2005 and ending
mid Dec. 2010. Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL JACKUPS (2)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Sovereign upper 60's early May 2005 late Jan. 2006 LOI for two wells plus option in mid 80's beginning
late Jan. 2006 and ending late April 2006.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Heritage low 70's mid June 2005 late Mar. 2006 Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
UPGRADE (1)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Endeavor - - - Singapore shipyard for upgrade to 10,000 ft. capable
5th Generation rig. Estimated completion early 2007.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
COLD STACKED (1)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean New Era - - - Cold stacked Dec. '02.
- ------------------------------------------------------------------------------------------------------------------------------------
PURCHASE PENDING--RESERVED FOR UPGRADE (1)
- ------------------------------------------------------------------------------------------------------------------------------------
Garden Banks** - - - Currently retired from active service as drilling
and production platform.
- ------------------------------------------------------------------------------------------------------------------------------------
NOTES:
* GENERALLY, RIG UTILIZATION RATES APPROACH 95-98% DURING CONTRACTED PERIODS;
HOWEVER, UTILIZATION RATES CAN BE ADVERSELY IMPACTED BY ADDITIONAL DOWNTIME
DUE TO UNSCHEDULED REPAIRS AND MAINTENANCE, WEATHER CONDITIONS AND OTHER
FACTORS.
**DIAMOND OFFSHORE SERVICES COMPANY HAS ENTERED INTO A DEFINITIVE AGREEMENT TO
PURCHASE THE GARDEN BANKS, SUBJECT TO CERTAIN CONDITIONS, WHICH IS EXPECTED TO
BE CONSUMMATED IN SEPTEMBER 2005. DIAMOND OFFSHORE DOES NOT CURRENTLY OWN THE
RIG.
GOM = Gulf of Mexico